写入Shapefi

Question

我在用python编写/读取Shapefile时遇到问题。我有一个点数组，我想用pyshp将它们写入多边形。本规范的相关部分包括：

dividedRects = [(7598325.0, 731579.0, 7698325.0, 631579.0), (7598325.0, 631579.0, 7698325.0, 611641.0), (7698325.0, 731579.0, 7728636.0, 631579.0), (7698325.0, 631579.0, 7728636.0, 611641.0)]

def createPolys(dividedRects):
    w = shapefile.Writer(shapefile.POLYGON)
    for i in range(0, len(dividedRects)):
        print i
        topLeft = [dividedRects[i][0],dividedRects[i][1]]
        topRight = [dividedRects[i][2], dividedRects[i][1]]
        bottomRight = [dividedRects[i][2], dividedRects[i][3]]
        bottomLeft = [dividedRects[i][0], dividedRects[i][3]]
        w.poly(parts=[[topLeft,topRight,bottomRight,bottomLeft]])
        w.field("ID", "C", "40")
        w.field("Events", "C", "40")
        w.record(str(i), str(0))
    w.save('cellFile')

createPolys(dividedRects)

这会导致错误：

^{pr2}$

{{cd2>

def createPolys(dividedRects):
    w = shapefile.Writer(shapefile.POLYGON)
    for i in range(0, len(dividedRects)):
        print i
        topLeft = [dividedRects[i][0],dividedRects[i][1]]
        topRight = [dividedRects[i][2], dividedRects[i][1]]
        bottomRight = [dividedRects[i][2], dividedRects[i][3]]
        bottomLeft = [dividedRects[i][0], dividedRects[i][3]]
        w.poly(parts=[[topLeft,topRight,bottomRight,bottomLeft]])
#         w.field("ID", "C", "40")
#         w.field("Events", "C", "40")
#         w.record(str(i), str(0))
    w.save('cellFile')

当我从文件中读取记录时，会出现一个断言错误：

createPolys(dividedRects)

sf2 = shapefile.Reader("cellFile")
print sf2.records()
shapes = sf2.shapes()
bbox = shapes[1].bbox
#['%.3f' % coord for coord in bbox]
print bbox
points = shapes[1].points
print points

AssertionError                            Traceback (most recent call last)
<ipython-input-37-597af0b882ba> in <module>()
      1 sf2 = shapefile.Reader("cellFile")
----> 2 print sf2.records()
      3 shapes = sf2.shapes()
      4 bbox = shapes[1].bbox
      5 #['%.3f' % coord for coord in bbox]

C:\Users\Me\Anaconda2\lib\site-packages\shapefile.pyc in records(self)
    528         """Returns all records in a dbf file."""
    529         if not self.numRecords:
--> 530             self.__dbfHeader()
    531         records = []
    532         f = self.__getFileObj(self.dbf)

C:\Users\Me\Anaconda2\lib\site-packages\shapefile.pyc in __dbfHeader(self)
    464             self.fields.append(fieldDesc)
    465         terminator = dbf.read(1)
--> 466         assert terminator == b("\r")
    467         self.fields.insert(0, ('DeletionFlag', 'C', 1, 0))
    468 

AssertionError: 

当我去掉循环，写了一个记录，它似乎工作正常。发生什么事？在

Answer 1

我不知道pyshp库，但无论如何我会尽力帮助你的。在

这两个w.field()命令出现在for循环中。这可能会导致两列“ID”和“Events”被多次定义。当您只写一个记录（polygon）时，它可以正常工作（即w.record()命令包含两个值）。在第一次迭代之后，将有4列、6列等。这可以解释你描述的行为。在

尝试移动w.field()前面的两条w.field()行。在

当您注释w.record()时，您将获得一个shp（和shx）文件，其中包含与相应的dbf文件不同的多个记录。这解释了读取时的断言错误。在

与您的问题无关，您还可以使用enumerate（内置函数）简化代码。在

w = shapefile.Writer(shapefile.POLYGON)
w.field("ID", "C", "40")
w.field("Events", "C", "40")    
for i,rect1 in enumerate(dividedRects):
    print i
    topLeft = [rect1[0],rect1[1]]
    topRight = [rect1[2], rect1[1]]
    bottomRight = [rect1[2], rect1[3]]
    bottomLeft = [rect1[0], rect1[3]]
    ....

（我不能测试，因为我没有pyshp）祝你好运！在